fixup! mingw: support long paths (git-for-windows#5550)

When rebasing c8b6c1d (mingw: support long paths, 2015-07-28) on
top of 391bcea (compat/mingw: support POSIX semantics for atomic
renames, 2024-10-27) a newly introduced MAX_PATH buffer was not
increased to MAX_LONG_PATH.

This fixes git-for-windows#5476

Author: dscho

compat/mingw.c

@@ -2857,9 +2857,9 @@ int mingw_rename(const char *pold, const char *pnew)
 			 * flex array so that the structure has to be allocated on
 			 * the heap. As we declare this structure ourselves though
 			 * we can avoid the allocation and define FileName to have
-			 * MAX_PATH bytes.
+			 * MAX_LONG_PATH bytes.
 			 */
-			WCHAR FileName[MAX_PATH];
+			WCHAR FileName[MAX_LONG_PATH];
 		} rename_info = { 0 };
 		HANDLE old_handle = INVALID_HANDLE_VALUE;
 		BOOL success;